Bolt-nut.



l. S. MCGUIGAN.

BOLT NUT.

APPLICATION Flu-:D ocT. 3x, 1914.

l 859?. Patented Dec. 19, 1916.

Pili! irren ESQU-NUT.

Specification oi' Letters Patent.

Patented @ed t9, ri,

lippleatcni filed Gctober 3l, 191e. Serial No. 869,549.

new and useful improvement in Bolt-Nuts,

of which the following is a full, clear, and exact description, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to nuts such are used on bolts, and has for itsmaia object to provide a practicable and inexpensive nut which issodesigned. that it will be impossible for the object through which theboit passes to damage or strip suilicient threads on the bolt, due torelative movement between said object and bolt, to prevent the nut frombeing tightened to compensate for elongation or stretching ot' the bolt.

In other Words, the main object ot' my in vention is to provide a nutthat can be tightened even after the threads 'on the bolt have becomeabrasion of the object through which. the 'bolt passes.

Another Object is to provide a nut of the character mentioned, that isas strong as a standard nut and which is so designed that it exerts apositive thrust against the object through which the bolt passes. Andstill lanother object is to provide a nut of the character' described inwhich an integral portion of the nut that protects the threads on thebolt also serves toloek the nut and prevent it from rotating baclnvardlyon the bolt.

Briefly described, my invention consists in a nut provided on its innerside with an v integral. portion which is so constructed that '40 'itwill not bear vagainst or come in Contact with the threads of the bolton which the nut is mounted, said integral portion pret erablyconsisting of an annular collar on the inner side of the nut whoseinternal diameter is greater than the diameter of the internallyscrew-threaded bore in the nut that receives the bolt. l/Vhen the nut isarranged yin operative position on the bolt said integral collar bearsagainst the object through which. the bolt passes and exerts 'a directthrust against said object in exactly the same manner as an ordinary nutacts on the Vobject through which the bolt passes. If the bolt, or themember through which 55 the bolt passes, move relatively to each othersuficiently to cause said member to Worn or damaged by rubbing or mar ordamage the threads on the bolt, this will not interfere with tighteningthe nut to compensate for elongation or stretching of the bolt, owing tothe fact that the threads on the bolt which are brought into servicewhen the nut is tightened are protected by the integral portion orcollar on the inner side of the nut. v

Figure l of the drawings isa sectional view illustrating my improved nutapplied to a bolt fused for securing railway track splice bars inoperative position; and F ig. 2 is a perspective view of said nut.

The nut A is preferably of standard make, so far as external dimensionsand number oi screw threads are concerned, and it isl provided on itsinner side with an integral rigid portion l that has a blunt edge whichbears against 'the object B, through which the bolt C passes. Thisintegral portion l preferably consists of a collar or annular rib on theinner side of the nut, whose internal diameter is enough greater thanthe internally screw-threaded bore 2 in the nut to prevent said collar lfrom bearing on the threads oi' the bolt. If the bolt, o r the member Bthrough which the bolt passes, should move relatively to each othersufficiently to cause said member B to wear down the threads on thebolt, this will not interfere with subse- 1 quent tightening of the nut,owing to the fact that the threads on the bei: which are brought intoservice when the nut is tightened are protected by the portion 1 on theinner` side of the nut. In other. words, the portion l of my improvednut insures sufficient threads on the bolt remaining intlieir originalcondition to permit the nut to be tightened time after time.

While the nut is capable of general use,

it is particularl;7 adapted for use on track bars and the nuts on thebolts, said Washersv soon Wear out the threads on the portions of thebolts that pass through the washers and render them unfit for use, this,of course,

vlrieing due to the fact that the excessive vibration to .which railway.track structures are subjected and the expansion and contraction of thetrack rail'scauses the nut look Wash- ,Sete for elongation orstretching' olf the bolts, such bolts can only be used for a shortperiod, due, of course, to the fact that the nut lock Washers or thesplice bars Clemege the threads on the bolts to such aK degree that thenuts can only be taken up or tigl'itenecl a few times. Consequently, thecost of replacing Worn bolts is quite an item in the maintenance of a,railway track, for the tziflic is heavy the track bolts fre quently weerout in the course of e few months.

My improved nut overcomes the necessity of replacing track boltsfrequently and enebles such bolts to be used until the heads on sainehave Worn down to such an extent that they tire 'only it ltrifle largerthan the opening in the splice bar through Whieh the Shank of lthe boltpasses. ln other words, by providing "the nut With i portion thatprotects the threads on the portion ot' the bolt lying between thesplice bar und the inte nelly sereW-threeded bore in the nut, it ispossible to tighten the nut time after time, es these protected threadsremain in their original condition, :incl consequently, will cooperatewith the threads on the nut. 'llhereiore, iny improved nut not only'el'ects e. greet saving in the cost of n'iziinteining t railway track.,flue te not having to renew the truck bolts frequently, but it alsoeiiiects e greet Saving in labor, in that it overcomes the necessityremoving Worn bolts and substituting new ones.

The collar l (loes net prejeet laterally beyond the marginal edges ei.the nut, :incl

igeoeeef/ it consists of in integ-1l rigid portieM the nut, it-eierts e,direct thrust aggiunse t. splice bei' when the hut is tightened in ectlythe sume manner es an ordinary i :iets on :i splice ber or on en objectthi which the bolt busses. rJ'Che portion l. o .uut is provided withteeth la, es shown in Fig. 2, that bite into the splice ber or otlmember through which the bolt passes7 e, thus prevent the nut irene.turning; bechwztrilly on the bolt. i te Having thus described myinvention, l claim and desire to secure by Letters l ent is:

A bolt nut having e body portion for gnging the threads of the bolt onWhich ti nut mounted :in annuler coller on inner side of said boflyportion Whicl rigidv and integrally eonneeted to seid be portion, seidcoller having :i center oper which is enough larger than the bolt so thecollar will not Contact With the beit1 e :i plurality oi integral teethen Seial t that ere adapted to bite into the nien against which the nutbeers, seid teet r'- ing so disposed that they prevent thi from exitingor tiltihg siclewise mit .l biting end of each tooth entendingpari-:ilYrto the fece of the member against which i nut beurs so that earch toothwill engage member evenly and throughout the en length et' its bitingedge.

in testimony whereof hereunto zu'li signature in the presence o two withthis twenty-eiglith doy of Uctober, l

JSEPH S. MeGUGfi/:Ui

Witnesses 2 W, L Shonen, Geoiieri Eintritte

